So...since our Duolingo lady had such a bad rep...I guess they switched her? I like the new one because it seems much more fluid on her part. But in this excercise Im fairly certain she just said Cloisi[mwid]...is that correct too? And then across the board or just this verb..?
She is saying 'cloiseann muid'. This form (known as 'analytic', in contrast to the 'synthetic' version 'cloisimid'), is an acceptable alternative across the board for the first person plural in the present tense. It is one of those things that vary according to regional dialect.
In the past, synthetic forms were more widespread, and they are more common in Munster. For example, I have friends who will commonly use 'bhíos' (= 'bhí mé'), as well as third-person plurals in the aimsir caite ending in -adar, e.g. 'thángadar' (='tháinig siad'). Some interesting stuff on this topic here: http://www.gaeilge.org/synthetic.html